Max BHP from these components:
07 June 2011, 01:00 PM
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Max BHP from these components:
At what stage will the following 'max out' BHP wise?
750cc Injectors - at normal fuel pressure, and +0.5bar or what ever is safe.
NGK #7 Spark Plugs
Walbro 255 fuel pump
Cheers
07 June 2011, 01:19 PM
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Friend has 330bhp i believe.....for more you need different turbo.
Last edited by beliblisk; 07 June 2011 at 01:20 PM .
Reason: grammer
07 June 2011, 01:24 PM
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750cc will be maxed at 100% IDC with normal fuel pressure at 550bhp(maybe little more),i'm running 650cc which are rated to 480-490bhp at 100% IDC
07 June 2011, 01:55 PM
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5.6bhp per 1cc/min fuel flow rate, so as yuriy says 535ish bhp
07 June 2011, 04:30 PM
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^^^^ sorry i can't do the sums. 5.6 x 750cc /4 is 1050hp. what the right formula?
07 June 2011, 04:41 PM
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Quote:
Originally Posted by
bigsinky
^^^^ sorry i can't do the sums. 5.6 x 750cc /4 is 1050hp. what the right formula?
I think is 750x4=3000/5.25=571bhp
Jura
07 June 2011, 07:21 PM
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What increase do u get for upping the fuel pressure? And is it safe?
07 June 2011, 10:34 PM
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RE: Injectors, what is the correct formula to work it out? As Jura's 571 would be ideal, but 535 is cutting it too fine.
07 June 2011, 10:42 PM
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Quote:
Originally Posted by
chrisdicko
RE: Injectors, what is the correct formula to work it out? As Jura's 571 would be ideal, but 535 is cutting it too fine.
Have look at this quote
https://www.scoobynet.com/showpost.p...postcount=1756
Jura
07 June 2011, 10:49 PM
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But not sure,how many cc will actually flow 750cc...
07 June 2011, 11:01 PM
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Thanks for the link, I remember reading about that now!
07 June 2011, 11:07 PM
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Quote:
Originally Posted by
chrisdicko
Thanks for the link, I remember reading about that now!
Have look on this similar figures from injectors.
http://www.scoobypedia.co.uk/index.p...rFromInjectors
But i would suggest FPR will be good additions.
Jura
07 June 2011, 11:08 PM
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I've got a FPR.
07 June 2011, 11:12 PM
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Also, is it a bad thing running the injectors at 100% duty, or is it best not to?
07 June 2011, 11:30 PM
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Quote:
Originally Posted by
chrisdicko
Also, is it a bad thing running the injectors at 100% duty, or is it best not to?
In my view,its not the best,but this depend which turbo you want run in future,but you have FPR with which you can go further..
Jura
08 June 2011, 07:44 AM
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Quote:
Originally Posted by
jura11
I think is 750x4=3000/5.25=571bhp
Quote:
Originally Posted by
chrisdicko
I've got a FPR.
I hope so! all efi cars do
08 June 2011, 11:24 AM
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08 June 2011, 11:44 AM
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Chris I have a spare 290lph walbro pump down at pennine subaru, if you are needing one sure we can work something out
08 June 2011, 12:04 PM
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Thanks for the offer Banny
I've actually just ordered a new HRC one!
Last edited by chrisdicko; 08 June 2011 at 12:15 PM .
08 June 2011, 10:11 PM
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Quote:
Originally Posted by
chrisdicko
Also, is it a bad thing running the injectors at 100% duty, or is it best not to?
You need some head room in your injectors or you might end up in a situation where the fuel mixture leans out. For example cold day, with a slight boost spike - if your injectors are already running 100%, they can't inject more fuel to compensate for the denser air and extra boost so the mixture goes lean...
Anders
08 June 2011, 10:51 PM
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Oh yeah, that makes sense
09 June 2011, 07:26 AM
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when i map cars i aim for max 85% duty cycle on the injectors
09 June 2011, 10:20 AM
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Hmmmm, well hopefully I will be aiming for 520ish.
09 June 2011, 10:30 AM
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Quote:
Originally Posted by
chrisdicko
Hmmmm, well hopefully I will be aiming for 520ish.
They should be ok, at 3bar fuel pressure on 740s I ran 520 quite comfortably
09 June 2011, 10:40 AM
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Nice one, thanks. Suppose if it does become an issue, the pressure can be cranked up on the day.
09 June 2011, 12:59 PM
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Also, what effect will adding methanol have on the injectors?
09 June 2011, 03:29 PM
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You have to run more fuel with meth so they need to be able to flow more.
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07 June 2011, 01:00 PM
Max BHP from these components:
